Final answer:
The sample proportion cannot be determined based on the given information.
Step-by-step explanation:
To determine the sample proportion at which the p-value is equal to 0.05, we need to refer to a specific hypothesis test scenario. The information provided in the question is not sufficient to determine the sample proportion directly. We would need more information about the null hypothesis, alternative hypothesis, and the specific test being conducted. Therefore, none of the given options (A, B, C, D) can be determined as the correct sample proportion.